[pitivi] mainwindow: Initialize "result" in _exportProjectAsTarCb

[Jean-FranÃois Fortin Tam <jfft src gnome org>]

commit 734bc07980f82cc20f45dd03dd67667265a53056
Author: Jean-FranÃois Fortin Tam <nekohayo gmail com>
Date:   Thu Aug 9 00:18:27 2012 -0400

    mainwindow: Initialize "result" in _exportProjectAsTarCb
    
    This prevents an UnboundLocalError when the user ends up
    not choosing a tarball to export the project to.

 pitivi/mainwindow.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/mainwindow.py b/pitivi/mainwindow.py
index 3746320..e800f9e 100644
--- a/pitivi/mainwindow.py
+++ b/pitivi/mainwindow.py
@@ -589,6 +589,7 @@ class PitiviMainWindow(gtk.Window, Loggable):
 
     def _exportProjectAsTarCb(self, unused_action):
         uri = self._showExportDialog(self.app.current)
+        result = None
         if uri:
             result = self.app.projectManager.exportProject(self.app.current, uri)